<!DOCTYPE html>
<html>
<body>
<script src="../../../resources/gc.js"></script>
<script src="../../../resources/js-test.js"></script>
<script>

window.jsTestIsAsync = true;

var callbackWasTriggered = false;
var nodeIterator, callbackObservation, nodeFilterObservation,
    nodeIteratorObservation;

(async () => {
  // Do initialization work in an inner function to avoid references to
  // objects remaining live on this function's stack frame.
  // (http://crbug.com/595672/).
  (function() {
    var callback = function(node) {
      callbackWasTriggered = true;
      return NodeFilter.FILTER_ACCEPT;
    };

    nodeIterator = document.createNodeIterator(document,
        NodeFilter.SHOW_ELEMENT, callback, false);
    callbackObservation = internals.observeGC(callback);
    nodeFilterObservation = internals.observeGC(nodeIterator.filter);
    nodeIteratorObservation = internals.observeGC(nodeIterator);
  })()

  await asyncGC();
  shouldBeFalse('nodeFilterObservation.wasCollected');
  shouldBeFalse('callbackObservation.wasCollected');

  (function() {
    nodeIterator.nextNode();
    nodeIterator = null;
  })();

  shouldBeTrue('callbackWasTriggered');

  await asyncGC();
  shouldBeTrue('nodeIteratorObservation.wasCollected');
  shouldBeTrue('nodeFilterObservation.wasCollected');
  shouldBeTrue('callbackObservation.wasCollected');

  finishJSTest();
})();
</script>
</body>
</html>
